IMac freezes randomly

My iMac randomly freezes once in a while, I can only move the mouse but nothing else. Manually on/off is required to get the system back to working.
Running 10.6.7

Well, odd Freezes can happen too :
If you use a program that requires too much or the entire RAM (it happens a lot with  Corel's Painter for exemple).
If you installed a lot of fonts in the font library system's folder.
Font conflicts can ruin a Mac and make him freeze or make programs crushs, did you installed Fonts on your system?
If it is the case, open your font book and see if there are dots at the irght of the fonts name, that means there is a font conflict, and believe me it's very treaky and vicious. The best solution is to create an administrator system account, then delete the other administrator session (but before that be sure you saved all the files/apps by copiying/dragging them to the respective folders of the new administrator account). Then, if you want to reinstall fonts, be sure that you put them in your User library and not on the system's library.
If it's not the case either, It's maybe a hard drive issue (eminent crush), or even an other hardware problem like the analogical board whiwch can give youan endless waiting curssor... the screen can turn pink too sometimes.

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    These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
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    ☞ Some private information, such as your name, may appear in the log. Anonymize before posting.
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    I am investigating the same problem for more than two weeks.
    Might have found the solution...
    And this solution is odd!
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    Randomly.
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    No. Checked and double checked.
    Reset all (epr)rom's/ram's in the machine.
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    Hope it works for you too!
    *Please let me know.*
    Good luck,
    kind regards,
    Danny
    PROCEDURE
    1.
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    drag the iTunes programm folder to the trash can
    2.
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    restart
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    empty the trash
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    empty the trash
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    repair disk permissions
    15.
    log OUT
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